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Merge branch 'sched/urgent'
[linux-2.6/x86.git] / fs / squashfs / squashfs_fs.h
blobb4a4e539a08ca99846979777e738279962779568
1 #ifndef SQUASHFS_FS
2 #define SQUASHFS_FS
3 /*
4 * Squashfs
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
7 * Phillip Lougher <phillip@squashfs.org.uk>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2,
12 * or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 *
23 * squashfs_fs.h
24 */
25
26 #define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
27 #define SQUASHFS_MAJOR 4
28 #define SQUASHFS_MINOR 0
29 #define SQUASHFS_START 0
30
31 /* size of metadata (inode and directory) blocks */
32 #define SQUASHFS_METADATA_SIZE 8192
33 #define SQUASHFS_METADATA_LOG 13
34
35 /* default size of data blocks */
36 #define SQUASHFS_FILE_SIZE 131072
37 #define SQUASHFS_FILE_LOG 17
38
39 #define SQUASHFS_FILE_MAX_SIZE 1048576
40 #define SQUASHFS_FILE_MAX_LOG 20
41
42 /* Max number of uids and gids */
43 #define SQUASHFS_IDS 65536
44
45 /* Max length of filename (not 255) */
46 #define SQUASHFS_NAME_LEN 256
47
48 #define SQUASHFS_INVALID_FRAG (0xffffffffU)
49 #define SQUASHFS_INVALID_XATTR (0xffffffffU)
50 #define SQUASHFS_INVALID_BLK (-1LL)
51
52 /* Filesystem flags */
53 #define SQUASHFS_NOI 0
54 #define SQUASHFS_NOD 1
55 #define SQUASHFS_NOF 3
56 #define SQUASHFS_NO_FRAG 4
57 #define SQUASHFS_ALWAYS_FRAG 5
58 #define SQUASHFS_DUPLICATE 6
59 #define SQUASHFS_EXPORT 7
60 #define SQUASHFS_COMP_OPT 10
61
62 #define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
63
64 #define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
65 SQUASHFS_NOI)
66
67 #define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
68 SQUASHFS_NOD)
69
70 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
71 SQUASHFS_NOF)
72
73 #define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
74 SQUASHFS_NO_FRAG)
75
76 #define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
77 SQUASHFS_ALWAYS_FRAG)
78
79 #define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
80 SQUASHFS_DUPLICATE)
81
82 #define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
83 SQUASHFS_EXPORT)
84
85 #define SQUASHFS_COMP_OPTS(flags) SQUASHFS_BIT(flags, \
86 SQUASHFS_COMP_OPT)
87
88 /* Max number of types and file types */
89 #define SQUASHFS_DIR_TYPE 1
90 #define SQUASHFS_REG_TYPE 2
91 #define SQUASHFS_SYMLINK_TYPE 3
92 #define SQUASHFS_BLKDEV_TYPE 4
93 #define SQUASHFS_CHRDEV_TYPE 5
94 #define SQUASHFS_FIFO_TYPE 6
95 #define SQUASHFS_SOCKET_TYPE 7
96 #define SQUASHFS_LDIR_TYPE 8
97 #define SQUASHFS_LREG_TYPE 9
98 #define SQUASHFS_LSYMLINK_TYPE 10
99 #define SQUASHFS_LBLKDEV_TYPE 11
100 #define SQUASHFS_LCHRDEV_TYPE 12
101 #define SQUASHFS_LFIFO_TYPE 13
102 #define SQUASHFS_LSOCKET_TYPE 14
103
104 /* Xattr types */
105 #define SQUASHFS_XATTR_USER 0
106 #define SQUASHFS_XATTR_TRUSTED 1
107 #define SQUASHFS_XATTR_SECURITY 2
108 #define SQUASHFS_XATTR_VALUE_OOL 256
109 #define SQUASHFS_XATTR_PREFIX_MASK 0xff
110
111 /* Flag whether block is compressed or uncompressed, bit is set if block is
112 * uncompressed */
113 #define SQUASHFS_COMPRESSED_BIT (1 << 15)
114
115 #define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
116 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
117
118 #define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
119
120 #define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
121
122 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
123 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
124
125 #define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
126
127 /*
128 * Inode number ops. Inodes consist of a compressed block number, and an
129 * uncompressed offset within that block
130 */
131 #define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
132
133 #define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
134
135 #define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\
136 << 16) + (B)))
137
138 /* Translate between VFS mode and squashfs mode */
139 #define SQUASHFS_MODE(A) ((A) & 0xfff)
140
141 /* fragment and fragment table defines */
142 #define SQUASHFS_FRAGMENT_BYTES(A) \
143 ((A) * sizeof(struct squashfs_fragment_entry))
144
145 #define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
146 SQUASHFS_METADATA_SIZE)
147
148 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
149 SQUASHFS_METADATA_SIZE)
150
151 #define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
152 SQUASHFS_METADATA_SIZE - 1) / \
153 SQUASHFS_METADATA_SIZE)
154
155 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
156 sizeof(u64))
157
158 /* inode lookup table defines */
159 #define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64))
160
161 #define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
162 SQUASHFS_METADATA_SIZE)
163
164 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
165 SQUASHFS_METADATA_SIZE)
166
167 #define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
168 SQUASHFS_METADATA_SIZE - 1) / \
169 SQUASHFS_METADATA_SIZE)
170
171 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
172 sizeof(u64))
173
174 /* uid/gid lookup table defines */
175 #define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
176
177 #define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
178 SQUASHFS_METADATA_SIZE)
179
180 #define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
181 SQUASHFS_METADATA_SIZE)
182
183 #define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
184 SQUASHFS_METADATA_SIZE - 1) / \
185 SQUASHFS_METADATA_SIZE)
186
187 #define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
188 sizeof(u64))
189 /* xattr id lookup table defines */
190 #define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id))
191
192 #define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \
193 SQUASHFS_METADATA_SIZE)
194
195 #define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \
196 SQUASHFS_METADATA_SIZE)
197
198 #define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \
199 SQUASHFS_METADATA_SIZE - 1) / \
200 SQUASHFS_METADATA_SIZE)
201
202 #define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\
203 sizeof(u64))
204 #define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16))
205
206 #define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff))
207
208 /* cached data constants for filesystem */
209 #define SQUASHFS_CACHED_BLKS 8
210
211 #define SQUASHFS_MAX_FILE_SIZE_LOG 64
212
213 #define SQUASHFS_MAX_FILE_SIZE (1LL << \
214 (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
215
216 /* meta index cache */
217 #define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
218 #define SQUASHFS_META_ENTRIES 127
219 #define SQUASHFS_META_SLOTS 8
220
221 struct meta_entry {
222 u64 data_block;
223 unsigned int index_block;
224 unsigned short offset;
225 unsigned short pad;
226 };
227
228 struct meta_index {
229 unsigned int inode_number;
230 unsigned int offset;
231 unsigned short entries;
232 unsigned short skip;
233 unsigned short locked;
234 unsigned short pad;
235 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
236 };
237
238
239 /*
240 * definitions for structures on disk
241 */
242 #define ZLIB_COMPRESSION 1
243 #define LZMA_COMPRESSION 2
244 #define LZO_COMPRESSION 3
245 #define XZ_COMPRESSION 4
246
247 struct squashfs_super_block {
248 __le32 s_magic;
249 __le32 inodes;
250 __le32 mkfs_time;
251 __le32 block_size;
252 __le32 fragments;
253 __le16 compression;
254 __le16 block_log;
255 __le16 flags;
256 __le16 no_ids;
257 __le16 s_major;
258 __le16 s_minor;
259 __le64 root_inode;
260 __le64 bytes_used;
261 __le64 id_table_start;
262 __le64 xattr_id_table_start;
263 __le64 inode_table_start;
264 __le64 directory_table_start;
265 __le64 fragment_table_start;
266 __le64 lookup_table_start;
267 };
268
269 struct squashfs_dir_index {
270 __le32 index;
271 __le32 start_block;
272 __le32 size;
273 unsigned char name[0];
274 };
275
276 struct squashfs_base_inode {
277 __le16 inode_type;
278 __le16 mode;
279 __le16 uid;
280 __le16 guid;
281 __le32 mtime;
282 __le32 inode_number;
283 };
284
285 struct squashfs_ipc_inode {
286 __le16 inode_type;
287 __le16 mode;
288 __le16 uid;
289 __le16 guid;
290 __le32 mtime;
291 __le32 inode_number;
292 __le32 nlink;
293 };
294
295 struct squashfs_lipc_inode {
296 __le16 inode_type;
297 __le16 mode;
298 __le16 uid;
299 __le16 guid;
300 __le32 mtime;
301 __le32 inode_number;
302 __le32 nlink;
303 __le32 xattr;
304 };
305
306 struct squashfs_dev_inode {
307 __le16 inode_type;
308 __le16 mode;
309 __le16 uid;
310 __le16 guid;
311 __le32 mtime;
312 __le32 inode_number;
313 __le32 nlink;
314 __le32 rdev;
315 };
316
317 struct squashfs_ldev_inode {
318 __le16 inode_type;
319 __le16 mode;
320 __le16 uid;
321 __le16 guid;
322 __le32 mtime;
323 __le32 inode_number;
324 __le32 nlink;
325 __le32 rdev;
326 __le32 xattr;
327 };
328
329 struct squashfs_symlink_inode {
330 __le16 inode_type;
331 __le16 mode;
332 __le16 uid;
333 __le16 guid;
334 __le32 mtime;
335 __le32 inode_number;
336 __le32 nlink;
337 __le32 symlink_size;
338 char symlink[0];
339 };
340
341 struct squashfs_reg_inode {
342 __le16 inode_type;
343 __le16 mode;
344 __le16 uid;
345 __le16 guid;
346 __le32 mtime;
347 __le32 inode_number;
348 __le32 start_block;
349 __le32 fragment;
350 __le32 offset;
351 __le32 file_size;
352 __le16 block_list[0];
353 };
354
355 struct squashfs_lreg_inode {
356 __le16 inode_type;
357 __le16 mode;
358 __le16 uid;
359 __le16 guid;
360 __le32 mtime;
361 __le32 inode_number;
362 __le64 start_block;
363 __le64 file_size;
364 __le64 sparse;
365 __le32 nlink;
366 __le32 fragment;
367 __le32 offset;
368 __le32 xattr;
369 __le16 block_list[0];
370 };
371
372 struct squashfs_dir_inode {
373 __le16 inode_type;
374 __le16 mode;
375 __le16 uid;
376 __le16 guid;
377 __le32 mtime;
378 __le32 inode_number;
379 __le32 start_block;
380 __le32 nlink;
381 __le16 file_size;
382 __le16 offset;
383 __le32 parent_inode;
384 };
385
386 struct squashfs_ldir_inode {
387 __le16 inode_type;
388 __le16 mode;
389 __le16 uid;
390 __le16 guid;
391 __le32 mtime;
392 __le32 inode_number;
393 __le32 nlink;
394 __le32 file_size;
395 __le32 start_block;
396 __le32 parent_inode;
397 __le16 i_count;
398 __le16 offset;
399 __le32 xattr;
400 struct squashfs_dir_index index[0];
401 };
402
403 union squashfs_inode {
404 struct squashfs_base_inode base;
405 struct squashfs_dev_inode dev;
406 struct squashfs_ldev_inode ldev;
407 struct squashfs_symlink_inode symlink;
408 struct squashfs_reg_inode reg;
409 struct squashfs_lreg_inode lreg;
410 struct squashfs_dir_inode dir;
411 struct squashfs_ldir_inode ldir;
412 struct squashfs_ipc_inode ipc;
413 struct squashfs_lipc_inode lipc;
414 };
415
416 struct squashfs_dir_entry {
417 __le16 offset;
418 __le16 inode_number;
419 __le16 type;
420 __le16 size;
421 char name[0];
422 };
423
424 struct squashfs_dir_header {
425 __le32 count;
426 __le32 start_block;
427 __le32 inode_number;
428 };
429
430 struct squashfs_fragment_entry {
431 __le64 start_block;
432 __le32 size;
433 unsigned int unused;
434 };
435
436 struct squashfs_xattr_entry {
437 __le16 type;
438 __le16 size;
439 char data[0];
440 };
441
442 struct squashfs_xattr_val {
443 __le32 vsize;
444 char value[0];
445 };
446
447 struct squashfs_xattr_id {
448 __le64 xattr;
449 __le32 count;
450 __le32 size;
451 };
452
453 struct squashfs_xattr_id_table {
454 __le64 xattr_table_start;
455 __le32 xattr_ids;
456 __le32 unused;
457 };
458
459 #endif
x86 "subsystem" repository